Infinity 506 Programmable Engine Management System (30-7106) by AEM. The Infinity 506 and Infinity 508 ECUs deliver state-of-the-art electronic fuel injection (EFI) control capabilities typically found only at upper echelons of Motorsports. Through the Infinity ECU, AEM makes this technology affordable for both professional race teams and amateur racers. The Infinity 506 is designed for racing engines with up to 6 cylinders. It features a smaller footprint than the Infinity 708/710 (5.855” x 5.55” x 1.8”) and a single, weatherproof 80-pin connector.